The variable was not properly sent to the backing bean

I am experiencing an issue with a certain piece of code. I have a variable called fieldToStore that is defined. When I alert it or check its value in the firebug console, everything seems fine. However, when I pass it to myBean, it always ends up being undefined if it's a String value or false if it's boolean. Any suggestions on what might be causing this?

<a4j:commandButton id="bt1" action="#{myBean.doSomething}" onclick="fieldToStore=false;saveFieldState();">
</a4j:commandButton>        
<a4j:jsFunction name="saveFieldState" action="#{myBean.dummyAction}" />
   <a4j:actionparam name="fieldToStore" assignTo="#{myBean.fieldToStore}" />
</a4j:jsFunction>

My expectation is that after clicking on bt1, the value of myBean.fieldToStore should be false, based on the javascript variable fieldToStore.

javascriptajaxjsfajax4jsf

Answer №1

If you are currently utilizing <a4j:actionParam>, it is essentially a hybrid of f:param and f:actionListener, where the value attribute is assigned to the property in assignTo.

Consider switching to <a4j:param> for a more efficient approach. Check out this example from the official documentation

Answer №2

After some investigation, I was able to identify the issue... It turns out that the problem lied in my implementation of the jsFunction on the onclick event:

onclick="fieldToStore=false;saveFieldState();

The correct approach should be as follows:

onclick="fieldToStore=false;saveFieldState(fieldToStore);

I noticed that the example provided in the richfaces documentation can be misleading:

<body onload="callScript()">
  <h:form>
         ...
        <a4j:jsFunction name="callScript" data="#{bean.someProperty1}" reRender="someComponent" oncomplete="myScript(data.subProperty1, data.subProperty2)">
              <a4j:actionparam name="param_name" assignTo="#{bean.someProperty2}"/>
        </a4j:jsFunction>
        ...
  </h:form>
  ...
</body>

In my opinion, it would make more sense if it were written as onload="callScript(param_name)".

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